I should point out that after room treatment, my next recommendation tends to be an amplifier with Audyssey MultEQ in-room calibration. I've never heard a listening environment that didn't sound unambiguously better with it enabled.
Yes. Because one of the settings shown after the full room color sweeps is dB, and the sweeps will often set various speakers a bit quieter. (The goal of Audessey calibration is to eliminate frequency resonance hot spots in common listening positions, as well as get flat response from your speaker setup.)
